Commit b1b397ae authored Oct 27, 2020 by David Woodhouse Committed by Paolo Bonzini Nov 15, 2020

vfio/virqfd: Drain events from eventfd in virqfd_wakeup()



Don't allow the events to accumulate in the eventfd counter, drain them
as they are handled.

Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
Message-Id: <20201027135523.646811-3-dwmw2@infradead.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Acked-by: Alex Williamson <alex.williamson@redhat.com>

parent 28f13267

drivers/vfio/virqfd.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -46,6 +46,9 @@ static int virqfd_wakeup(wait_queue_entry_t *wait, unsigned mode, int sync, void
		__poll_t flags = key_to_poll(key);

		if (flags & EPOLLIN) {
		u64 cnt;
		eventfd_ctx_do_read(virqfd->eventfd, &cnt);

		/* An event has been signaled, call function */
		if ((!virqfd->handler \|\|
		virqfd->handler(virqfd->opaque, virqfd->data)) &&

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